The Fractional Fourier Transform (FrFT) performs better interference suppression than the fast Fourier Transform (FFT) when the signal-of-interest (SOI) or interference is nonstationary. Minimum mean-square error (MMSE) based filtering in the FrFT domain provides additional benefit in interference suppression in non-stationary environments. However, MMSE filtering requires computational covaria...

Time-frequency techniques constitutes a major improvement in signal analysis, namely at the field of biomedical signals in which the interdisciplinary nature of the proposed questions implies the development of new strategies to answer to specific problems. Timefrequency analysis using Wavelets, Wigner-Ville transform and more recently the HilbertHuang Transform (HHT) constitutes the core of th...

The Fractional Fourier Transform (FrFT) provides significant interference suppression over the Fast Fourier Transform (FFT) when the signal-of-interest (SOI) or interference is non-stationary. Its main limitation is estimating the optimum rotational parameter ‘a’. Current techniques choose ‘a’ that gives the minimum mean-square error (MMSE) between an SOI and its estimate. Such techniques are c...

abstract background: peritoneal dialysis has a number of complications including increased blood glucose. although exercise has been suggested to resolve this complication, most patients are not active. the present study aimed at determining the effects of twice-weekly, 40-min sessions of pedaling on a stationary bicycle on mean fasting blood sugar (fbs) and 2-h postprandial blood sugar (ppbs) ...

Quadrature signal processing is used in many fields of science and engineering, and quadrature signals are necessary to describe the processing and implementation that takes place in modern digital communication systems. It serves two purposes: to determine the parameters needed for the construction of a necessary model, and to confirm if the model constructed represents the physical phenomenon...

Previously, fault diagnosis of fixed or steady state mechanical failures (e.g., pumps in nuclear power plant turbines, engines or other key equipment) applied spectrum analysis (e.g., fast Fourier transform, FFT) to extract the frequency features as the basis for identifying the causes of failure types. However, mechanical equipment for increasingly instant speed variations (e.g., wind turbine ...

This paper presents the dynamic modeling and design of micro motion compliant parallel mechanism with flexible intermediate links and rigid moving platform. Modeling of mechanism is described with closed kinematic loops and the dynamic equations are derived using Lagrange multipliers and Kane’s methods. Euler-Bernoulli beam theory is considered for modeling the intermediate flexible link. Based...